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-rw-r--r--toys/pending/chsh.c196
1 files changed, 97 insertions, 99 deletions
diff --git a/toys/pending/chsh.c b/toys/pending/chsh.c
index 1895755c..194946de 100644
--- a/toys/pending/chsh.c
+++ b/toys/pending/chsh.c
@@ -10,15 +10,13 @@ config CHSH
bool "chsh"
default y
help
- usage: chsh [-s login_shell] [user]
+ usage: chsh [-s SHELL] [USER]
- The "change shell" command changes the user login shell.
+ Change user's login shell.
- -s login_shell Use specified shell rather than interactive prompt
+ -s Use SHELL instead of prompting
- The shell must be an absolute path to an executable file. An unpriviliged
- user can only change his/her own shell to one listed in /etc/shells, and only if
- he/she is not restricted (implementation-defined).
+ Non-root users can only change their own shell to one listed in /etc/shells.
*/
#define FOR_chsh
@@ -30,97 +28,97 @@ GLOBALS(
void chsh_main()
{
- int i;
- FILE *file;
- size_t size, buf_size;
- char *user, *line, *shell, *password, *encrypted;
- struct passwd *passwd_info;
- struct spwd *shadow_info;
-
- // Use max login name size for buffer size
- if (-1 == (buf_size = sysconf(_SC_LOGIN_NAME_MAX))) buf_size = 256;
-
- if (!(user = malloc(buf_size * sizeof(user)))) perror_exit("Failed to allocate memory");
- if (!(shell = malloc(buf_size * sizeof(shell)))) perror_exit("Failed to allocate memory");
- if (!(line = malloc(buf_size * sizeof(line)))) perror_exit("Failed to allocate memory");
- if (MAP_FAILED == (password = mmap(NULL, buf_size, PROT_WRITE | PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS | MAP_LOCKED | MAP_NORESERVE, -1, 0))) perror_exit("Failed to get memory map");
-
- // Get uid user information, may be discarded later
- if (!(passwd_info = getpwuid(getuid()))) perror_exit("Failed to get passwd record");
-
- if ((user = *toys.optargs)) {
- errno = 0;
- if (!(passwd_info = getpwnam(user)) && !errno) error_exit("Failed to get user info");
-
- // Are we either root or changing our own shell?
- if (getuid() && strcmp(passwd_info->pw_name, user)) error_exit("Permission denied\n");
- } else user = passwd_info->pw_name;
-
- // Get a password, encrypt it, wipe it, and check it
- if (!(shadow_info = getspnam(passwd_info->pw_name))) perror_exit("Failed to get shadow record");
- if (!read_password(password, buf_size, "Password: ")) error_exit("Failed to read password\n");
- if (!(encrypted = crypt(password, shadow_info->sp_pwdp))) perror_exit("Failed to encrypt password");
- memset(password, 0, buf_size);
- if (!munmap(password, buf_size)) perror_exit("Failed to unmap memory");
- if (strcmp(encrypted, shadow_info->sp_pwdp)) perror_exit("Incorrect password");
-
- // Get new shell (either -s or interactive)
- if (!(file = fopen("/etc/shells", "r"))) perror_exit("Failed to open /etc/shells");
- if (toys.optflags) shell = TT.s;
- else {
- xprintf("Changing the login shell for %s\nEnter the new value, or press ENTER for default\n Login shell [%s]: ", user, passwd_info->pw_shell);
-
- errno = 0; size = 0;
- while (EOF != (i = fgetc(stdin))) {
- if (errno) perror_exit("Failed to read character from stdin");
-
- if ('\n' != i) *(shell + size++) = i;
- else {
- *(shell + size) = '\0'; break;
- }
- }
- }
-
- // Is shell in /etc/shells?
- if (strlen(shell)) {
- line = NULL; size = 0; i = 0; errno = 0;
-
- while (EOF != getline(&line, &size, file)) {
- if (errno) perror_exit("Failed to read from /etc/shells");
-
- size = strlen(line) - 1;
- if ('\n' == *(line + size)) *(line + size) = '\0';
-
- if (!strcmp(shell, line)) {
- i = 1; break;
- }
- }
-
- if (!i) error_exit("Shell not found in '/etc/shells'");
- } else {
-
- // Get default shell, ignoring comments and blank lines
- do {
- shell = NULL;
- if (-1 == getline(&shell, &size, file)) perror_exit("Failed to read from /etc/shells");
- } while (*shell != '/');
-
- size = strlen(shell) - 1;
- if ('\n' == *(shell + size)) *(shell + size) = '\0';
- }
-
- // Update shell and write passwd entry to tempfile
- strncpy(passwd_info->pw_shell, shell, buf_size);
- if (!(file = tmpfile())) perror_exit("Failed to create tempfile");
- if (!putpwent(passwd_info, file)) perror_exit("Failed to write to passwd entry");
-
- // Move passwd entry from file to string
- if (-1 == (i = ftell(file))) perror_exit("Failed to get tempfile offset");
- if (buf_size < i && !realloc(line, i)) perror_exit("Failed to reallocate memory");
- rewind(file);
- if (fread(line, 1, i, file) < i) perror_exit("Failed to read from tempfile");
-
- // Update /etc/passwd using that string
- if (-1 == update_password("/etc/passwd", user, NULL)) perror_exit("Failed to remove passwd entry");
- if (-1 == update_password("/etc/passwd", user, line)) perror_exit("Failed to add passwd entry");
+ int i;
+ FILE *file;
+ size_t size, buf_size;
+ char *user, *line, *shell, *password, *encrypted;
+ struct passwd *passwd_info;
+ struct spwd *shadow_info;
+
+ // Use max login name size for buffer size
+ if (-1 == (buf_size = sysconf(_SC_LOGIN_NAME_MAX))) buf_size = 256;
+
+ if (!(user = malloc(buf_size * sizeof(user)))) perror_exit("Failed to allocate memory");
+ if (!(shell = malloc(buf_size * sizeof(shell)))) perror_exit("Failed to allocate memory");
+ if (!(line = malloc(buf_size * sizeof(line)))) perror_exit("Failed to allocate memory");
+ if (MAP_FAILED == (password = mmap(NULL, buf_size, PROT_WRITE | PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS | MAP_LOCKED | MAP_NORESERVE, -1, 0))) perror_exit("Failed to get memory map");
+
+ // Get uid user information, may be discarded later
+ if (!(passwd_info = getpwuid(getuid()))) perror_exit("Failed to get passwd record");
+
+ if ((user = *toys.optargs)) {
+ errno = 0;
+ if (!(passwd_info = getpwnam(user)) && !errno) error_exit("Failed to get user info");
+
+ // Are we either root or changing our own shell?
+ if (getuid() && strcmp(passwd_info->pw_name, user)) error_exit("Permission denied\n");
+ } else user = passwd_info->pw_name;
+
+ // Get a password, encrypt it, wipe it, and check it
+ if (!(shadow_info = getspnam(passwd_info->pw_name))) perror_exit("Failed to get shadow record");
+ if (!read_password(password, buf_size, "Password: ")) error_exit("Failed to read password\n");
+ if (!(encrypted = crypt(password, shadow_info->sp_pwdp))) perror_exit("Failed to encrypt password");
+ memset(password, 0, buf_size);
+ if (!munmap(password, buf_size)) perror_exit("Failed to unmap memory");
+ if (strcmp(encrypted, shadow_info->sp_pwdp)) perror_exit("Incorrect password");
+
+ // Get new shell (either -s or interactive)
+ if (!(file = fopen("/etc/shells", "r"))) perror_exit("Failed to open /etc/shells");
+ if (toys.optflags) shell = TT.s;
+ else {
+ xprintf("Changing the login shell for %s\nEnter the new value, or press ENTER for default\n Login shell [%s]: ", user, passwd_info->pw_shell);
+
+ errno = 0; size = 0;
+ while (EOF != (i = fgetc(stdin))) {
+ if (errno) perror_exit("Failed to read character from stdin");
+
+ if ('\n' != i) *(shell + size++) = i;
+ else {
+ *(shell + size) = '\0'; break;
+ }
+ }
+ }
+
+ // Is shell in /etc/shells?
+ if (strlen(shell)) {
+ line = NULL; size = 0; i = 0; errno = 0;
+
+ while (EOF != getline(&line, &size, file)) {
+ if (errno) perror_exit("Failed to read from /etc/shells");
+
+ size = strlen(line) - 1;
+ if ('\n' == *(line + size)) *(line + size) = '\0';
+
+ if (!strcmp(shell, line)) {
+ i = 1; break;
+ }
+ }
+
+ if (!i) error_exit("Shell not found in '/etc/shells'");
+ } else {
+
+ // Get default shell, ignoring comments and blank lines
+ do {
+ shell = NULL;
+ if (-1 == getline(&shell, &size, file)) perror_exit("Failed to read from /etc/shells");
+ } while (*shell != '/');
+
+ size = strlen(shell) - 1;
+ if ('\n' == *(shell + size)) *(shell + size) = '\0';
+ }
+
+ // Update shell and write passwd entry to tempfile
+ strncpy(passwd_info->pw_shell, shell, buf_size);
+ if (!(file = tmpfile())) perror_exit("Failed to create tempfile");
+ if (!putpwent(passwd_info, file)) perror_exit("Failed to write to passwd entry");
+
+ // Move passwd entry from file to string
+ if (-1 == (i = ftell(file))) perror_exit("Failed to get tempfile offset");
+ if (buf_size < i && !realloc(line, i)) perror_exit("Failed to reallocate memory");
+ rewind(file);
+ if (fread(line, 1, i, file) < i) perror_exit("Failed to read from tempfile");
+
+ // Update /etc/passwd using that string
+ if (-1 == update_password("/etc/passwd", user, NULL)) perror_exit("Failed to remove passwd entry");
+ if (-1 == update_password("/etc/passwd", user, line)) perror_exit("Failed to add passwd entry");
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 06:43:13 +0000